Anyone interested in a fully-curated history of individuals and events important in the movement, philosophy and religion of (Modern) Spiritualism
could do worse than to look into the SNU's extensive - FREE - online resource.
Paul Gaunt curates their library and current and back issues of the online publication are readily available. Follow the link at the foot of this posting to open a FREE subscription.
Issues of 'Pioneer' are .pdf file downloads which can be viewed using standard built-in browser readers, free-standing readers such as Sumatra and Adobe Reader, or via free phone-apps from Google and Apple stores.